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WARNING If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury, or death. • Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. • WHAT TO DO IF YOU SMELL GAS − Do not try to light any appliance. − Do not touch any electrical switch; do not use any phone in your building. − Immediately call your gas supplier from a neighbor’s phone.
1. Welcome ................................................................................................................................... 4 1.1 To The Installer ................................................................................................................. 4 1.2 To The Consumer ............................................................................................................. 4 1.3 Acronyms and Abbreviations ...................................................................
Thank you for purchasing a Rinnai Tankless Water Heater. Before installing and operating this water heater, be sure to read these instructions completely and carefully to familiarize yourself with the water heater’s features and functionality. • It is recommended that a trained and qualified professional who has attended a Rinnai training class complete the installation. The warranty may be voided due to any improper installation.
AVERTISSEMENT WARNING If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury, or death. • Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. • WHAT TO DO IF YOU SMELL GAS − Do not try to light any appliance. − Do not touch any electrical switch; do not use any phone in your building. − Immediately call your gas supplier from a neighbor’s phone.
This manual contains the following important safety symbols. Always read and obey all safety messages. The following precautions apply to the installer and consumer. Read and follow all instructions in this section. WARNING WARNING Indicates a potentially hazardous situation which, if not avoided, could result in personal injury or death. DO NOT adjust the internal gas valve. The design is such that adjustment is not required. Warranty may be voided if the internal gas valve is adjusted.
• DO NOT store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. • (NE PAS entreposer ni utiliser d’essence ou ni d’autres vapeurs ou liquides inflammables à proximité de cet appareil ou de tout autre appareil.) • • Always check the water temperature before entering a shower or bath. Hot water outlet pipes leaving the water heater can be hot to touch.
Topics in this section • Model Numbers Explained • Front and Bottom View • Components • Specifications • Dimensions • Accessories Example: CXP199i CX P 199 i Installation Type: i: Interior (Indoor) Maximum Gas Consumption (Btu/h): • 199: 199,000 • 160: 160,000 Pump: P: Pump (Internal Pump Included in Model) Application Type: CX: Commercial 8 Rinnai Tankless Water Heater Installation and Operation Manual
Front View Vent Connections Controller Supply Connections Figure 1: Front View Bottom View Condensate Drain Hot Water Outlet Cold Water Inlet Gas Figure 2: Bottom View Rinnai Tankless Water Heater Installation and Operation Manual 9
Exhaust Air Inlet Flue Gas Exhaust Air Inlet Filter Fan with Integrated Venturi Combustion Analysis Port Burner Assembly Gas Valve Ignition Unit Primary Heat Exchanger Secondary Heat Exchanger Condensate Trap PC Board Pump PC Board (CXP [with pump] models only) (Cover removed for clarity) Controller removed for clarity Figure 3: Components 10 Rinnai Tankless Water Heater Installation and Operation Manual
Table 2. Specifications Indoor Units with Pump Indoor Units without Pump (Includes outdoor installations with Rinnai-specified outdoor vent cap) CX199i CX160i Minimum Gas Consumption Btu/h Maximum Gas Consumption Btu/h CXP199i CXP160i 15,000 199,000 160,000 199,000 160,000 0.26-11.1 GPM (1.0-42 L/min) 0.26-9.0 GPM (1.0-34 L/min) 0.26-11.1 GPM (1.0-42 L/min) 0.26-9.0 GPM (1.
Measurements: in. (mm) Front Panel View Side Panel View Vent Connection: 2 in. (51 mm) nominal PVC/CPVC/ Polypropylene or 3 in./5 in.
Figure 5: Supply Connections Table 3. Supply Connections Connection Connection Size Gas 3/4 in. NPT Cold Inlet 3/4 in. NPT Hot Outlet 3/4 in. NPT Condensate Drain 1/2 in.
Numerous optional accessories are available for purchase for your Rinnai Tankless Water Heater. Listed below are some commonly purchased accessories. For a complete list of accessories, visit www.rinnai.us. For questions, or to purchase an accessory, contact your local Rinnai dealer/ distributor or Rinnai Customer Care at 1-800-621-9419. Table 4.
Table 4. Accessories (Continued) Product Product Description ScaleCutter • Part #: 103000038 Filters and reduces the amount of scale entering the water heater allowing for greater water heater longevity. ScaleCutter Refill Cartridge • Part #: 103000039 Refill cartridge for the ScaleCutter filter assembly. Drain Down Kit • Part #: 104000059 Provides freeze protection by immediately draining the water heater upon loss of power.
Table 4. Accessories (Continued) Product Recirculation Pump • Part #: GTK03U Product Description Image A pump system can be incorporated with Rinnai Circ-Logic recirculation technology in a dedicated recirculation system. Cascade Cable • Part #: REU-CSA-C1, REU-CSA-C2 Electronically connects up to 24 water heaters and enables them to function as one hot water source. Note: One cable is needed for each water heater.
• Topics in this section • • • • • • • • • • • • • • • Installation Guidelines What You will Need Choose an Installation Location Mount the Water Heater to the Wall Vent the Water Heater Connect the Water Supply Install the Isolation Valves Install the Pressure Relief Valve Connect the Condensate Drain Connect the Gas Supply Connect the Power Supply Initial Settings Configure Parameter Settings External Pump with Circ-Logic Post-Water Heater Installation Checklist THIS SECTION IS INTENDED FOR THE INSTALLE
Unpack the Rinnai Tankless Water Heater package and verify the following contents are included. If any items are missing, contact your local dealer/distributor or call Rinnai Customer Care at 1-800621-9419. # ❷ ❶ Item ❶ Rinnai Tankless Water Heater ❷ Vent screens (x2) and vent screen screws (x2). The vent screen prevents debris and other objects from entering the terminal. One vent screen is for the air inlet; the other is for the exhaust. ❸ Wall Mounting Bracket ❹ Self-Tapping Screws (x4) (4.
Table 5. Water Quality Guidelines When selecting an installation location, you must ensure that all water heater and venting clearances will be met and that the vent length will be within required limits. Consider the installation environment, water quality, and the need for freeze protection. Requirements for the gas line, water lines, electrical connection, and condensate disposal can be found in their respective installation sections in this manual.
Make sure that in case of freezing weather the water heater and its water lines are protected to prevent freezing. Damage due to freezing is not covered by the warranty. When connected to a 120-volt power supply, the water heater will not freeze when the outside air temperature is as cold as -22°F (-30°C) for indoor installations or -4°F (-20°C) for outdoor installations, when protected from direct wind exposure.
TOP FRONT SIDE BOTTOM Figure 7: Clearances Table 6. Clearances Location Clearance to Combustibles and Non-Combustibles Top Bottom/Ground 2 in. (51 mm) (0 in. from vent components) 12 in. (305 mm) Front 0 in. (Clearance for servicing is 24 in. / 610 mm in front of water heater) Back Sides (Left and Right) Vent 0 in. 2 in. (51 mm) (Add 0.25 in. / 6.35 mm for recess box) 0 in. CAUTION If clearances are not met, damage to the property and water heater may occur.
You Will Need: • Rinnai Tankless Water Heater • Wall Mounting Bracket 3. Insert the top bracket into the wall mounting bracket. Make sure the wall mounting bracket is attached to the wall and can hold the weight of the water heater before you fully let go. Supplied by Installer: • Level • Minimum of 6 screws (more screws may be needed depending on wall type) Use appropriate screws for type of wall constructions. Instructions: 1.
4. Securely screw the top and bottom brackets into the wall, making sure the screws are flush with the wall. • Use any of the holes in the top and bottom brackets. • Make sure the securing method is sufficient to support the weight of the water heater. Refer to the water heater weight in section “3.4 Specifications.” IMPORTANT The water heater must be installed in an upright position. Do not install the water heater upside down or on its side or back.
• • Internal water heaters can be installed as direct vent or non-direct vent applications. • When installed as Direct Vent, refer to the “Direct Vent Approved Vent Manufacturers and Products” section (within section “4.5.4 1. Direct Vent”) for a complete list of approved vent manufacturers and products. • When installed as Non-Direct Vent (Room Air), the vent must be Category IV, listed by a national recognized testing agency or solid core schedule 40 PVC when accepted by local codes.
1. Install the water heater. 2. Determine the vent termination method— horizontal or vertical, concentric, or twin pipes, etc. Check to determine whether local codes supersede the following clearances: • Avoid termination locations near a dryer vent. 3. Determine proper location for wall or roof penetration for each termination. • Avoid termination locations near commercial cooking exhaust. 4.
Two types of venting options are available: Concentric Pipe (Indoor) Twin Pipe (Indoor) Intake air and exhaust vent directly through a single concentric connection. Hot exhaust exits through the interior tube, while intake air enters through the outer layer. Intake air and exhaust vent directly through separate penetrations. Room Air (Indoor) Room air is used for combustion while exhaust vents to the outside. Direct Vent Water heater with outdoor vent cap.
1. Direct Vent (Concentric Pipe and Twin Pipe) Direct Vent Approved Vent Manufacturers and Products Following is a list of vent components and terminations for Direct Vent installations. Install the correct venting for your model according to the venting manufacturer’s instructions and the guidelines below. The information below is correct at time of publication and is subject to change without notice.
Equivalent Length (ft) Vertical Horizontal Diagram Product Description Manufacturer Manufacturer Part Number 52CVKGS6502 PVC Concentric Vent Kit 2 in. x 16 in. 20 52CVKGVS6502-28 PVC Concentric Vent Kit 2 in. x 28 in. 20 52CVKGVS6502-40 PVC Concentric Vent Kit 2 in. x 40 in. 20 ICRT2439 2 in. x 4 in. Concentric Roof Termination 20 2PPS-VKL/VK-TCL 2 in. x 4 in. Vertical Termination Cap Kit Concentric 20 2PPS-HKL 2 in. x 4 in. Horizontal Termination Kit Concentric 20 190288 2 in.
Equivalent Length (ft) Vertical Horizontal Diagram Product Description Manufacturer Part Number Manufacturer CENTRO THERM HEAT-FAB ROYAL IPEX UBBINK 3 in. /5 in. CONCENTRIC VENT TERMINATIONS 223174PP 223176PP 223177PP 3/5 Condensing Horizontal Termination Kit 8 7/10 in. 3/5 Condensing Horizontal Termination Kit 12 in. 3/5 Condensing Horizontal Termination Kit 21 in. 5 223186PP 3/5 Condensing Horizontal Diverter Termination Kit 19 in.
Equivalent Length (ft) Vertical Horizontal Diagram Product Description Manufacturer Manufacturer Part Number 3CGRLSV Vertical Adapter 1 3CGRLSH Horizontal Adapter 6 3CGRVT Vertical Termination 5 3CGRHT 3 in. x 5 in. Horizontal Termination Cap Kit Concentric 16 3PPS-VKL/VK-TCL 3 in. x 5 in. Horizontal Termination Cap Kit Concentric 20 3PPS-HKL 3 in. x 5 in. Horizontal Termination Kit Concentric 20 190388 3 in. x 5 in. Concentric Horizontal Termination 5 190395 3 in. x 5 in.
Equivalent Length (ft) Vertical Horizontal Diagram Product Description Manufacturer Part Number Manufacturer DURAVENT CENTROTHERM UBBINK 2 in. TWIN PIPE TERMINATIONS 223085NPP 2 in. (60) Condensing Wall Terminal Twin Pipe 10 ISELL0287UV 2 in. 87° Long PPS-UV 6 ISTT0220 2 in. Termination Tee 6 ISLPT0202 2 in. Low Profile Wall Termination 5 2PPS-HTPL 2 in. Twin Pipe Termination 10 2PPS-HSTL 2 in. Single Horizontal Termination 6 2PPS-TBL 2 in.
Equivalent Length (ft) Vertical Horizontal Diagram Product Description Manufacturer Part Number Manufacturer DURAVENT CENTROTHERM 3 in. TWIN PIPE TERMINTIONS ISELL0387UV 3 in. 87° Long PPS-UV 6 ISTT0320 3 in. Termination Tee 6 ISLPT0303 3 in. Low Profile Wall Termination 5 3PPS-HTPL 3 in. Twin Pipe Termination 10 3PPS-HSTL 3 in. Single Horizontal Termination 5 3PPS-TBL 3 in.
Table 10. Acceptable and Not Acceptable Elbows 3 in. Equivalent Length Vent Screen N/A N/A Tee 5 ft 5 ft 90° Elbow 6 ft 5 ft 45° Elbow 3 ft 2.5 ft Vertical Diagram Horizontal 2 in. Equivalent Length Product Descriptions Table 9. Various 2 in. or 3 in. Schedule 40 PVC/ CPVC Terminations Acceptable Acceptable 90° Elbows, Long Sweep 90° Elbows, Short Sweep Not Acceptable 90° Elbows, Close Turn Table 11.
The information below applies to Concentric and Twin Pipe: TERMINATION V SNOW I Figure 13: Direct Vent Termination Clearances Regulator vent outlet. In the event no regulator is present, H and I can be disregarded. Table 13. Clearances Ref A Direct Vent (Indoor Unit) 12 in. (30 cm) Direct Vent (Indoor Unit) 12 in. (30 cm) 36 in. (91 cm) 12 in.
1. Direct Vent (Concentric Pipe ) Concentric Pipe Overview Intake air and exhaust vent directly through a single concentric connection. Hot exhaust exits through the interior tube, while fresh air enters through the outer layer. Exhaust Intake air Intake air Figure 15: Concentric Pipe Figure 14: Concentric Pipe Termination Clearances Figure 16: Between terminals at different levels Figure 17: Between terminals at same level All terminations (horizontal and/or vertical) must terminate 12 in. (0.
Concentric Pipe: Installation Instructions 1. Remove and discard screw from concentric flue connection. Figure 18 2. Remove exhaust adapter ring (discard for concentric venting configurations.) Figure 19 Mount Concentric Pipe Through Wall If venting behind the unit through an exterior wall, align the wall mounting bracket template (located in literature bag) to the wall and follow instructions on the template for appropriate vent hole location.
1. Direct Vent (Twin Pipe ) Twin Pipe Overview Intake air and exhaust vent directly through separate penetrations. Figure 23 Twin Pipe Termination Clearances Intake Air 60 in. min Exhaust 12 in. (0.30 m) Minimum above intake air opening Exhaust Intake Air Roof Intake Air 12 in. (0.30 m) Above grade or anticipated snow level Figure 24: Twin Pipe Vertical Termination of Multiple Water Heaters 12 in. min 12 in. min 12 in. min 12 in. min Intake Air 12 in.
1. Direct Vent (Twin Pipe ) Twin Pipe Installation Instructions The water heater is equipped with a 2 in. (51 mm) pipe connection. With the use of a pipe reducer, installers can use a 3 in. (76 mm) pipe for the Intake air and exhaust. In this case, a 2 in./3 in. pipe reducer should be installed as close as possible to the water heater. 3. Install the intake air vent pipe. Ensure it is properly seated. Secure the intake air vent pipe to the intake air vent connection with the supplied screws.
1. Direct Vent (Twin Pipe ) Twin Pipe Example Vent Applications Slope horizontal exhaust 1/4 in. per foot (21 mm per meter) towards the water heater. DO NOT slope intake air pipe towards the water heater. Table 16 This configuration requires the use of a Concentric Vent Termination 2 in. or 3 in. PVC/ CPVC IPEX/ Royal Concentric Side Wall Termination Configuration This configuration requires the use of a Concentric Vent Termination 2 in. or 3 in.
2. Non- Direct Vent (Room Air and External ) Room Air and External Termination Clearances TERMINATION V SNOW I Figure 30: Room Air and External Termination Clearances Table 18 Ref Canadian Installations1 (CSA B149.1) Other than direct vent (Outdoor unit and/or Room Air) Description Clearance above grade, veranda, porch, deck, or balcony 12 in. (30 cm) 12 in. (30 cm) B Clearance to window or door that may be opened 36 in. (91 cm) 4 ft (1.
NOTE • Installation of Non-Direct Vent (Room Air) must use listed category IV venting. • All terminations (horizontal and/or vertical) must terminate 12 in. (30 cm) above grade or anticipated snow level. Exhaust Termination Clearances for Internal (Indoor) Room Air Applications 12 in. (0.30 m) 12 in. (0.30 m) 60 in. (1.52 m) vertically between terminals Figure 31 Termination Clearances for External (Outdoor) Installations 36 in. (0.
Room Air: Intake Air This water heater requires adequate air for ventilation and dilution of flue gases. Failure to provide adequate air can result in unit failure, fire, explosion, serious bodily injury or death. Use the following methods to ensure adequate air is available for correct and safe operation of this water heater. WARNING IMPORTANT Intake air must be free of corrosive chemicals. Do not provide air from corrosive environment. Appliance failure due to corrosive air is not covered by warranty.
Louvers and Grills Adequate air is required for all gas utilizing equipment in the location. Therefore, proper sizing of permanent openings, such as louvers or grills, must be considered to maintain the required free area. If the free area of the louver or grill design is not available, assume wood louvers will have 25% free area and metal louvers or grills will have 75% free area. Under no circumstance should the louver, grill or screen have openings smaller than 1/4 in.
Room Air: Installation Instructions 1. Remove and discard screw from combustion air vent connection. 4. Place the vent screen or room air screen inside elbow and secure with the supplied screw. Use the room air screen for environments where room air is dusty. Notes: • 2 in vent screen supplied with water heater. • Room air screen is available as an accessory. Figure 34 Elbow Supplied screw 2. Remove and discard the combustion air vent cap. Vent screen Figure 37 Figure 35 5.
Room Air: Example Vent Applications 2 in. or 3 in. Schedule 40 PVC/CPVC or ABS Standard Upside Down “U” Vertical Termination configuration 2 in. or 3 in. Schedule 40 PVC/CPVC or ABS Snorkel Termination Configuration 2 in. or 3 in. Schedule 40 PVC/CPVC or ABS Elbow or Tee Side Wall Termination Configuration 2 in. or 3 in. Schedule 40 PVC/CPVC or ABS Tee Vertical Termination Configuration Ubbink flexible venting approved for vertical non-direct vent (room air) applications only.
3. Common Vent (Indoor Units Only. Direct Vent and Non-Direct/Room Air Vent) Common venting allows multiple Rinnai Tankless Water Heaters to share the same vent system. When operating multiple water heaters in a common venting system, it is recommended to use Rinnai’s cascade cable (purchased separately) which electronically connects two water heaters so they function as one hot water source.
Connecting Multiple Water Heaters (Cascade Communication) With use of cascade cable(s) up to 24 water heaters can be electronically connected. This connection will rotate water heater operation order to ensure equal usage among the entire system and enables all water heaters connected to modulate operation and function as one hot water source. NOTE: For proper operation, do not combine different models with cascade communication. Cascade Cable Required: • • • • Cable Length: 26 ft.
Programming Cascade Communication Refer to the parameter setting section of this manual for instructions on how to access and change parameter settings. Table 22 Selection Setting Description Setting # A b 08 Cascade Secondary (2-24) Primary 09 Units in Standby (Cascade) 1 2 C d E F 3 4 5 6 0 8 Cascade: Primary: Select the water heater intended to be the Primary water heater for cascade communication. Set the parameter setting for this water heater to “Primary” (08b ).
• • • • • • The piping (including soldering materials) and components connected to this appliance must be approved for use in potable water systems. Purge the water line to remove all debris and air. Debris will damage the water heater. The appliance must not be connected to a system that was previously used with a non-potable water heating appliance. Ensure that the water filter on the water heater is clean and installed.
Isolation valves are not supplied with the water heater, but it is highly recommended to install the isolation valves. The isolation valves (part number MIVK-T-LW) provide the ability to isolate the water heater from the structure’s plumbing and allow quick and easy access to flush the heat exchanger. The isolation valves must meet American National Standard (ANSI Z21.10.3) / Canadian Standard (CSA 4.3).
• To prevent condensate damage, follow these guidelines: • • • • • • • Do not plumb the condensate drain with the pressure relief valve; both must be plumbed independently to drain. All condensate must drain and be disposed of according to local codes. Use only corrosion resistant materials for the condensate drain lines such as PVC pipe or plastic hose. The condensate drain pipe (along its entire length) must be at least the same diameter as the drain line (1/2 in. MNPT).
3. Cut crimp connectors off white wires and strip the insulation off of the two ends. To connect the condensate drain pipe: 1. Apply thread sealant to 1/2 in. MNPT condensate drain port. 2. Thread 1/2 in. NPT fitting onto condensate drain port. 3. Follow the steps in the next section: “Condensate Pump Safety Switch Wiring” (if needed). 4. Select an appropriate length of wire (18 AWG or greater) and strip the insulation off the ends.
Condensate Pump Safety Switch Installation Tankless Water heater To Condensate Pump Safety Switch Wires Wire Nut Connecting Two Wires Field-Supplied Field-SuppliedWires Wires Safety switch Wires Condensate Pump (field-supplied) should include internal safety switch and power cord. Power cord must be plugged into power source. Safety switch wires connect to the NO and COM contacts on the safety switch.
WARNING • A trained and qualified professional must install the gas supply. • Turn off 120V power supply. • Turn off the gas. • Gas is flammable. Do not smoke or provide other ignition sources while working with gas. • Do not turn on the water heater or gas until all fumes are gone. • Confirm the gas type before connecting. Failure to install correct gas type may result in injury or damage to the unit. To connect the gas supply, follow the instructions below: 5.
The gas supply must be capable of handling the entire gas load required at the location. Gas line sizing is based on gas type, the pressure drop in the system, the gas pressure supplied, and gas line type. For gas pipe sizing, refer to the National Fuel Gas Code, ANSI Z223.1/NFPA 54, or the Natural Gas and Propane Installation Code, CSA B149.
Natural Gas Table 25: Pressure Drop 3.0 in. wc Schedule 40 Metallic Pipe Intended use: Initial supply Inlet Pressure: Less than 2 psi pressure of 8.0 in. wc or greater. Specific Gravity: 0.60 Example Rinnai Model Gas Input: 199,000 A Btu/hr Additional Appliance Total Gas Input: Information in table Nominal Pipe Size (in.) obtained from NFPA 54, ANSI 65,000 B Btu/hr 1/2 3/4 1 1 1/4 Z223.1 - 2021.
WARNING • Do not use an extension cord or adapter plug with this appliance. • The water heater must be electrically grounded in accordance with local codes and ordinances or, in the absence of local codes, in accordance with the National Electrical Code, ANSI/ NFPA No. 70. • Indoor water heaters are equipped with a three-prong (grounding) plug for your protection against shock hazard and should be plugged directly into a properly grounded three-prong receptacle.
This tankless water heater is set up for natural gas and indoor installations as default. When power is connected for the first time, you need to confirm the settings below or change them properly. 3. Open the Rinnai Central app from your smart device and log into the Rinnai Central app with a professional account. 4. Push the Bluetooth button on the controller. The Bluetooth LED light turns solid.
3(B). If using propane gas: Press the up or down arrow button. The controller displays “LPG” (Liquid Propane Gas). 1. Supply power to the tankless water heater for the first time. The controller displays “SEt” and the Priority button LED light on the controller is blinking. Press the “On/Off” button to confirm Liquid Propane Gas. Proceed to step 4. LPG SEt Figure 60 Figure 57 4. The controller displays “In” (indoor). 2. Press the “Priority” button. The controller displays “nG” (natural gas).
5(B). If you install the tankless water heater outdoors with the Rinnai outdoor vent cap: Press the up or down arrow buttons. The controller displays “Out” (Outdoor). Press the “On/Off” button to confirm “Out” (Outdoor). Proceed to step 6. 7. The controller briefly displays “888” while a beeping sound is observed. Then, complete initial settings and the controller is off. 888 Out Figure 65 Figure 63 6.
WARNING DO NOT adjust parameter settings unless specifically instructed to do so. Certain elements of the installation may require adjusting the parameters of the tankless water heater. To adjust the parameters: 1. Locate the PC Board (lower front of unit). 2. Locate the two push buttons (A and B) on the PC Board. 3. Press the “A” button for 1 second. The controller displays 01A or 01b (Figure 64). A ………B Figure 67 4.
Table 27. Parameter Settings Setting Selection # Description A b 01 Maximum Set Temperature 140°F (60°C) 185°F (85°C) High Altitude 0 2 Installation Location Service Soon1 03 043 Recirculation Settings 0 5 Recirculation Mode2* Control Switch 06 Cascade 08 09 Units in Standby (Cascade) Gas Type 0 - 2,000 ft (0 - 610 m) 0.
WARNING Combustion analysis must be performed by a trained and qualified professional. To perform a combustion analysis: 1. Remove the front panel by removing the two screws and releasing the two latches. 2. Remove the clamp holding the combustion analysis port cap. 3. Remove the combustion analysis port cap and insert the gas analyzer probe into the port. 4. Put the water heater into operation for at least five minutes. Measure CO2 or O2, as applicable, in the exhaust system.
Rinnai CX Tankless Water Heaters include Circ-Logic technology that offers the comfort and convenience of instant hot water with the use of an external recirculation pump. Circ-Logic controls the on/off sequence and operation cycles of the external recirculation pump through the programming of the tankless water heater’s parameter settings. Smart-Circ™ is the factory default setting for recirculation.
Complete the following checklist when water heater installation is complete. You should be able to answer YES to each question. If you answer NO to any question, installation is not complete. Refer to the applicable section in the Rinnai Tankless Water Heater Installation and Operation Manual for additional information. For assistance, contact your local dealer or distributor, or call Rinnai Customer Care at 1-800-6219419.
YES NO If the condensate pump is installed, is it wired to deactivate the tankless water heater in the event of failure? For more information, refer to section “4.9.3 Condensate Pump Safety Switch Wiring.
AVERTISSEMENT Topics in this section • • • • • • • Safety Precautions Gas Operating Instructions Control Panel Setting the Temperature Performance Data Diagnostic Codes Configuring Recirculation (If Applicable) Assurezvous de bien suivre les instructions données dans cette notice pour réduire au minimum le risque d’incendie ou d’explosion ou pour éviter tout dommage matériel, toute blessure ou la mort.
• Keep the area around the appliance clear and free from combustible materials, gasoline, and other flammable vapors and liquids. • Do not use this appliance if any part has been under water. Immediately call a trained and qualified professional to inspect the appliance and to replace any part of the control system and any gas control which has been under water (N’utilisez pas cet appareil s’il a été plongé dans l’eau, même partiellement.
FOR YOUR SAFETY READ BEFORE OPERATING WARNING If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life. A. This appliance does not have a pilot. It is C. Use only your hand to push in or turn the gas equipped with an ignition device which control valve. Never use tools. If the gas automatically lights the burner. Do not try to control valve will not turn by hand, do not try light the burner by hand.
The controller panel allows you to adjust the water temperature, lock the controller on a set temperature, and view diagnostic information. 1 2 5 3 6 1. To lock the integrated controller, press and hold down the “Priority” button (Figure 74). 2. While holding down the “Priority” button, press the up arrow button (Figure 74) until a beep is heard (approximately 5 seconds). Then, release both buttons at the same time. 3. A key illuminates when the controller is locked.
IMPORTANT This water heater requires a minimum flow rate to operate. This rate can be found on the specification page in this manual. In some cases when you are not getting hot water or if the water alternates between hot and cold, it is due to the water flow being below or close to the minimum flow rate. Increasing the flow rate should resolve these problems in these cases. If you are experiencing issues with higher temperature settings, then reduce the temperature setting.
The water heater can deliver water at only one temperature setting at a time. The available temperatures are provided below. A temperature lower than 98°F (37°C) can be obtained at the tap by mixing with cold water. To change the temperature scale from Celsius to Fahrenheit or vice versa, press and hold the “On/ Off” button on the controller for 5 seconds while the water heater is OFF.
Table 31. Performance Data Table # Data Unit 0 1 Water Flow Rate x0.1 gal/min 02 Outgoing Temperature °F 03 Combustion Hours x100 Hours 04 Combustion Cycles * 05 Fan Frequency Hz 06 Additional Controllers Connected * 07 Water Flow Control Position 0=Mid 08 Inlet Temperature °F 09 Fan Current x10 mA 10 Total Bath Fill Amount Gallons 1 1 HEX Outlet Temp.
To display diagnostic codes: Turn off the water heater by pressing the “On/Off” button. Press and hold the “On/Off” button for 2 seconds and then the up arrow button simultaneously. The last nine maintenance codes display and flash one after the other. To exit diagnostic codes and return the water heater to normal operation, press and hold the “On/Off” button for 2 seconds and then the up arrow button simultaneously. Turn on the water heater by pressing the “On/Off” button.
15 Venturi Control • • • 16 Ensure the Venturi motor is operating correctly.* Replace gas valve assembly. Clear diagnostic code by resetting the main power supply to the water heater. High Outgoing Temperature (Safety shutdown because water heater is too hot) • Confirm fan motor is functioning correctly. • Replace the gas valve assembly. 17 • • • • • • • • • 52 Ensure gas type is correct. Ensure gas type parameter is correct. Please call Rinnai Technical Support.
65 Water Flow Control • • 66 • • • • • • • • • Measure the resistance values and voltage of the bypass servo valve.* Ensure the harness and connector are not wet. If the voltage from the PC Board is abnormal, replace the PC board; otherwise replace the bypass servo valve. FF Replace PC Board Figure 81 Ensure dip switch on PC board is in the OFF position. Ensure gas control wire is not loose or damaged. Ensure heater circuit is not grounded. Replace PC Board. Check flame rod and wire for damage.
This section applies to CXP models only. Smart-Circ™ is the factory default setting for recirculation. Smart-Circ™ allows the water heater to identify when hot water is used, and then operates recirculation on subsequent days to reduce wait time for hot water. If a fixed recirculation schedule is desired, then installation of an MC-195T-US Timer/controller or Wi-Fi Module is required.
Parameter Settings Refer to section “4.13 Configure Parameter Settings” for instructions on how to access and change parameter settings.
Two recirculation modes are available: DEDICATED MODE CROSSOVER MODE Hot Water Cold Water Dedicated mode (factory default) Home includes a dedicated circulation return line in the plumbing system. The water heater is shipped configured for the Dedicated Recirculation Line mode. Crossover mode - Home does not include a dedicated circulation return line. Requires installation of a thermal bypass valve (included with purchase for CXP models) at the farthest fixture in the plumbing system.
CROSSOVER MODE Figure 87 Plumbing Diagram (Crossover Mode) Note: Warm water may come out of the cold side of the faucet for a few seconds. Install thermal bypass valve at the farthest fixture from the tankless water heater.
Parameter Settings Refer to section “4.13 Configure Parameter Settings” for instructions on how to access and change parameter settings. Table 33 Setting # Setting Description 04 05 Selection A b C Recirculation Settings No Recirculation Recirculation (Dedicated) Recirculation (Crossover) Recirculation Mode Economy Comfort Commercial d 04 Recirculation Settings Crossover Mode: Adjust parameter setting to 04c for crossover recirculation applications.
DEDICATED MODE Figure 89 Plumbing Diagram (Dedicated Mode) Condensate Drain Line Floor Drain Gas Supply Line Cold Water Supply Line Hot Water Supply Line Locate Drain Valve as close as possible to the Cold Water Supply Tee Dedicated Recirculation Line Hot Water Fixtures Figure 90 82 Rinnai Tankless Water Heater Installation and Operation Manual
Parameter Settings Refer to the parameter setting section of this manual for instructions on how to access and change parameter settings. Table 36 Setting # 04 05 Selection Setting Description A No Recirculation Settings Recirculation Recirculation Mode b C Recirculation (Dedicated) Recirculation (Crossover) Comfort Commercial Economy d 04 Recirculation Settings Dedicate Mode: Adjust parameter setting to 04b for dedicated recirculation applications.
Topics in this section • Maintenance • Cleaning and Inspecting the Air Filter • Flushing the Heat Exchanger • Draining the Water Heater This water heater must be inspected annually by a trained and qualified professional. Repairs and maintenance shall be performed by a trained and qualified professional. The trained and qualified professional must verify proper operation after servicing.
MOTORS PRESSURE RELIEF VALVE Motors are permanently lubricated and do not need periodic lubrication. However you must keep fan and motor free of dust and dirt by cleaning annually. Operate the pressure relief valve manually once a year. In doing so, it will be necessary to take precautions with regard to the discharge of potentially scalding hot water under pressure. Ensure discharge has a safe place to flow. Contact with your body or other property may cause damage or harm.
FREEZE PROTECTION Make sure in case of freezing weather that the water heater and its water lines are adequately protected to prevent freezing. Damage due to freezing is not covered by the warranty. Refer to the “Freeze Protection” section (Section 4.3 Choose an Installation Location > Freeze Protection). The water heater may be drained manually. However, it is highly recommended that drain down solenoid valves be purchased and installed, which will automatically drain the water heater if power is lost.
This water heater includes a service indicator/reminder (Service Soon, SS). When selected in the parameter settings, an SS code will display on the controller indicating that it is time to flush and service the water heater. An LC diagnostic code also indicates the unit is beginning to lime/scale up and must be flushed. Failure to flush the appliance will cause damage to the heat exchanger. Damage caused by lime/scale build-up is not covered by the water heater’s warranty.
12. Operate the pump and allow the vinegar to circulate through the water heater for at least 1 hour at a rate of four gallons per minute (15.1 liters per minute). 13. Display shows “60” (Figure 97) which indicates the remaining flush time in minutes. The number decreases by 1 every minute. For some reasons, flushing needs to be paused, stop the pump. The number on the display does not decrease while the unit does not detect water flow.
Running a low volume of water through the water heater to prevent freezing: WARNING To avoid burns, wait until the equipment cools down before draining the water. The water in the appliance will remain hot after it is turned off. If the water heater is not going to be used during a period of possible freezing weather, it is recommended that the water inside the water heater be drained. To manually drain the water: 1. Shut off cold water supply and gas supply. 2. Turn off the controller. 3.
Topics in this section • • • • • • • • • Massachusetts State Gas Regulations Wiring Diagram Ladder Diagram Pressure Drop Curves Water Flow and Pump Performance Curves Guidelines for Additional Temperature Controllers Bluetooth Low Energy (BLE) and App Instructions Federal Communication Commission (FCC) Interference Statement Industry Canada Statement For Gas Models Sold in Massachusetts NOTICE BEFORE INSTALLATION: This direct-vent appliance must be installed by a properly trained and qualified professiona
Rinnai Tankless Water Heater Installation and Operation Manual Check Valve Min. 2' developed length Type L copper from water heater Product Approved Water Heater 91 Electronically controlled pump timer. Activates every 6 hours for 60 seconds. Wire to product approved pump. (or built- in pump) Hot Water Supply and Return to Heating Coil Gas supply Check Valve System installed with reverse acting aquastat to shutoff fan. Suggested but not required by 248 CMR.
PC BOARD Figure 103 92 Rinnai Tankless Water Heater Installation and Operation Manual
Figure 104 Rinnai Tankless Water Heater Installation and Operation Manual 93
Pressure Drop Curve: Metric (SI) System: Pressure Drop Curve: Imperial (British) System: Figure 105 94 Rinnai Tankless Water Heater Installation and Operation Manual
Water Flow Curve: NOTE: Maximum flow rates may vary based on set temperature, Delta T and altitude.
All Rinnai Tankless Water Heaters are equipped with an integrated digital temperature controller that allows for a precise water temperature set- point. Additional digital temperature controllers are available as accessories and must be purchased separately (detailed installation steps included with purchase). Wiring A maximum of four temperature controllers can be installed for a water heater or bank of water heaters; this includes the controller built into a Rinnai Tankless Water Heater.
Instructions on this page are correct at the time of publishing; however, these instructions may be updated without notice. To make sure you have the most current instructions, please visit rinnai.us/wifi (for United States installations) or rinnai.ca/wifi (for Canadian installations). To download the Rinnai Central app: 1. Scan the QR code shown to the right. 2. Download the Rinnai Central app from the app store.
FCC Interference Statement: This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules.
IC This device complies with ISED’s licence-exempt RSSs. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Le présent appareil est conforme aux CNR d’ ISED applicables aux appareils radio exempts de licence.
What is Covered? The Rinnai Standard Limited Warranty covers any defects in materials or workmanship when the product is installed and operated according to Rinnai written installation instructions, subject to the terms within this Limited Warranty document. This Limited Warranty applies only to products that are installed correctly in the United States and Canada. Improper installation may void this Limited Warranty.
What Is Not Covered? This Limited Warranty does not cover any failures or operating difficulties due to the following: • Accident, abuse, or misuse • Alteration of the product or any component part • Misapplication of this product • Improper installation (such as but not limited to): • Product being installed in a corrosive environment • Condensate damage • Improper venting • Incorrect gas type • Incorrect gas or water pressure • Absence of a drain pan under the appliance • Improper main
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